Open Road has been drafted in by the British telecoms network to work on several CSR initiatives.
Open Road CEO Graham McMillan told PRWeek that the agency was 'doing stakeholder work in support of its CSR programme', but declined to provide further information.
Vodafone's CSR initiatives include The Vodafone Foundation, which provides funding to charities, along with publishing an annual sustainability report.
In June, the mobile phone operator asked for proposals from agencies to help build its profile in the global enterprise market.
Vodafone UK's comms chief Aileen Thompson leaves at the end of August, to be replaced by the former comms head of holiday giant TUI UK, Christian Cull.
Thompson, who has been with Vodafone since 2004, stepped down as corporate comms director to 'explore new challenges'.